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2/5-((2/7)*x)-((1/3)*x) = 562/105 // - 562/105
2/5-((2/7)*x)-((1/3)*x)-(562/105) = 0
(-2/7)*x+(-1/3)*x+2/5-562/105 = 0
-13/21*x-104/21 = 0 // + 104/21
-13/21*x = 104/21 // : -13/21
x = 104/21/(-13/21)
x = -8
x = -8
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